#pragma once
#include <thread>
#include <vector>
#include <memory>
#include <mutex>
#include <iostream>
#include <semaphore>

#include <random.hpp>
#include <philosopher-state.hpp>

class Philosopher;

typedef std::shared_ptr<Philosopher> PhilosopherPtr;
typedef std::vector<PhilosopherPtr> ListOfPhilosophers;
typedef std::shared_ptr<ListOfPhilosophers> ListOfPhilosophersPtr;
extern std::mutex changingForkState;
extern std::mutex printing;

/**
 * \brief A class representing a single philosopher having his dinner.
 *
 * Philosophers are seated in a round table.
 * In order of being able to eat a philosopher should be able to take
 * the two forks on his sides so no other of its neighbor philosophers
 * should be eating at this time.
 */
class Philosopher {
private:
    //! The position of the philosopher in the table.
    int numberOfPhilosopher;

    //! What the philosopher is doing.
    PhilosopherState state{PhilosopherState::THINKING};

    //! The vector of philosophers in the table.
    ListOfPhilosophersPtr philosophers;

    //! The function to set the state of the philosopher.
    void
    setState(PhilosopherState state);

    //! Method to guess the numberOfPhilosopher of the left neighbor of this philosopher.
    size_t
    leftPhilosopherNumber(void);

    //! Method to guess the numberOfPhilosopher of the right neighbor of this philosopher.
    size_t
    rightPhilosopherNumber(void);

    //! Retrieve the left neighbor.
    PhilosopherPtr
    leftPhilosopher(void);

    //! Retrieve the right neighbor.
    PhilosopherPtr
    rightPhilosopher(void);

    //! Makes the philosopher think for a while.
    void
    think(void);

    //! The philosopher waits until the forks of his neighbors are free and then takes the two forks.
    void
    takeForks(void);
    

    //! The philosopher eats the spaghetti with the two forks.
    void
    eat(void);

    //! The philosopher puts the forks in the table to be used by his neighbors.
    void
    putForks(void);

public:
    //! Retrieves the philosopher state.
    PhilosopherState
    getState(void);

    /**
     * \brief Philosopher constructor
     * @param philosophers The vector of in the table philosophers.
     * @param numberOfPhilosopher The position of this philosopher in the table.
     */
    Philosopher(ListOfPhilosophersPtr philosophers, int numberOfPhilosopher);

    //! Whenever this philosopher was the two forks currently.
    std::binary_semaphore hasBothForks{0};

    //! Starts the philosopher dinner.
    void startThread(void);

    //! Test if the philosopher should be able to take both forks currently.
    void test(void);
};